Return-Path: Received: from rly-mf05.mx.aol.com (rly-mf05.mail.aol.com [172.20.29.175]) by air-mf08.mail.aol.com (v123.4) with ESMTP id MAILINMF084-95e4a0d9226148; Fri, 15 May 2009 12:02:59 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mf05.mx.aol.com (v123.4) with ESMTP id MAILRELAYINMF054-95e4a0d9226148; Fri, 15 May 2009 12:02:48 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1M4zr3-0007au-5P for rs_out_1@blacksheep.org; Fri, 15 May 2009 17:01:49 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1M4zr2-0007al-Q4 for rsgb_lf_group@blacksheep.org; Fri, 15 May 2009 17:01:48 +0100 Received: from c2bthomr01.btconnect.com ([213.123.20.119]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1M4zqy-00088i-I8 for rsgb_lf_group@blacksheep.org; Fri, 15 May 2009 17:01:48 +0100 Received: from [192.168.1.64] (host81-155-60-146.range81-155.btcentralplus.com [81.155.60.146]) by c2bthomr01.btconnect.com with ESMTP id LGK51808; Fri, 15 May 2009 17:01:38 +0100 (BST) Message-ID: <4A0D91E3.9040602@btconnect.com> Date: Fri, 15 May 2009 17:01:39 +0100 From: Richard Newstead User-Agent: Thunderbird 2.0.0.21 (Windows/20090302) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-Junkmail-Status: score=10/50, host=c2bthomr01.btconnect.com X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A0B0202.4A0D91E3.00D1,ss=1,fgs=0, ip=192.168.1.64, so=2007-10-30 19:00:17, dmn=5.7.1/2008-09-02 X-Junkmail-IWF: false X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Aerial current Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) After my success in getting more current into the aerial yesterday I decided to measure the RF current in the link (link coupled ATU) with a proper RF ammeter. I was somewhat surprised that the current pinned my 1 Amp RF meter. How can that be? I can think of some possible reasons: 1) The meter is wrong (it must be nearly 70 years old) 2) The impedance is not 50 Ohms which is odd because I assume the TX is designed to have a 50 Ohm output and I carefully adjusted the link for maximum power transfer last night). 3) The transmitter is giving out far more power than expected (seems unlikely). Any ideas? Incidentally, am I best to measure current in the link or in the aerail wire? 73 Richard PS - beacon on again 501.6kHz.